Electric switch



Oct. 29, 1935. H. M. DRESSEL ET AL ELECTRIC swmcn Filed A rii 12, 1935112' yen/0A5 Henry DreJJ'el Ken/262W (3 4/030!) p v1 0 Lr M JP? WAN w wd b E. a J 4 r WW g 2.01am 11 i.

Henry M.

Drem'el, cum, KM om...

Arlington Heights, and Edward J. Mastney, Berwyn, 111., asaignors to OakManufacturing Company, Chicago, 111., a corporation of lllinokApplication April 12, 1935, Serial No.--15.950 3 Claims. (01. 200-11This invention relates to electric switches and particularly to switchesfor use in radio receivers,

. and other apparatus where minute currents and potentials areencountered.

Referring to the drawing:

Figure 1 is a sectional elevation of one form of switch along line l- -lof Figure 3. I Figure 2 is a sectional elevation of a modified form ofswitch, along line 2-2 of Figure 4.

Figure 3 is a top view of the switch of Figure 1. Figure 4 is a top viewof the switch of Figure 2. Figure 5 is a detail. Referring to Figure 1,a shaft I passes through a metallic bushing 2, having a threaded portionI and a collar portion 4. Beyond collar portion v4 is a reduced mountingportion 5, on which is disposed a strip of-insulating material 6 of somephenol condensate. This material may be of any shape and is here shownas generally rectangular with the short sides curvilinear at I and 8. Itwill be noted that shaft I passes through the center portion of strip 5and this strip bears against collar portion 4 of bushing 2. Abuttingagainst the other side of strip 6 and disposed around collar portion 5,is a metal washer ill. The bushing 2, strip 6 and washer l aremaintained together, by spreading the edge ll of collar portion so thatit overlies washer l0 and locks the same in place.

One end of shaft I is cut down to provide a substantially rectangularrotor locking section l5, as shown in Figure 3. In this instance thelength of section I5 is sufficient to accommodate a metal washer l8 anda rotor l9. These two have suitable apertures punched through so thatthey may be locked against rotation. The free end of section I5 is thenspread over at to prevent the washer and rotor from slipping off theshaft.

The rotor assembly is positioned by threading shaft I through bushing 2.To maintain the shaft in the bushing, a circular slot 2| is providedaround shaft 1 at the edge of threaded portion 3 of bushing 2. A springring 22 is disposed in this slot, and forms an abutment against bushing2 to maintain the structure intact.

Rotor I9 is an elongated metal member having depending tips bent downtoward strip 6. Each tip 25 preferably has the two edges Qrved at 25 anda wide slot 21 cut in the connec edge. Cooperating with rotor I! are aplurality of stator contacts 29-32 inclusive. As is indicated in Figure3) two contacts are disposed at each end of strip 6 on the arc of acircle concentric with rotor ll. Since the contacts are all the same, adetailed description of one will suffice. Contact 28 comprises a bodyportion 25 rigidly maintained on strip 6 by means of an eyelet 36. Onone side of body portion is a connecting portion 31 suitably aperturedat 38 I to which wires may be soldered. Preferably portion 37 is bent upat an angle to body portion 35. The other side of body portion 35terminates in a bent over spring contact portion 40. The extreme tip ofis preferably provided at u the sides thereof with ears 4| bent downtoward strip 6. The width of portion 40 is somewhat 'less than thelength of slot 21 in rotor contact l9 whereby a locking or indexingaction is obtained. Spring portion 40 is normally biased I so that itfirmly presses against rotor 19.

In order to limit the rotation of member I8, washer I8 is provided witha circumferential slot M of predetermined angular extent. Forconvenience in assembly, washer I8 is shown with two such slotsdiametrically opposite to each other so that no particular care need beexercised with washer l8. Washer it has projecting therefrom at oppositepoints fingers 42 and 43. Finger 42 is bent upwardly and extends intoslot 4|. 1| Finger 43 is bent downwardly and extends through a slot 44in strip 6 and a slot 45 in bushing 2. This last finger 43 locks strip 6and bushing 2 together. These two fingers may be equal so that nospecial disposition of washer III is 80 necessary.

In Figures 2 and 4 a modified form of switch is shown where rotor I9 isinsulated from shaft l. The rotor locking portion l5 of the shaft islonger and accommodates washer l8, insulating washas er 50, rotor l9,insulating washer 5| and metal washer 52. Rotor I!) has a large centralaperture 53 stamped out to clear shaft I. Beyond this aperture, ears 54are stamped out and bent down. These ears 54 are adapted to engage slots"0 55 in insulating washer 50. Washer is preferably cut away so that asshown in Figure 4 it lies within the boundaries of rotor I9 although ofcourse this is not important. Rotor I! has an 'apertureri ear 56connecting a wire thereto. a

What is claimed is:

1. An electric switch comprising an insulating base having an aperture.therethrough, a bushing disposed in said aperture, a shaft rotatablymounted in said bushing and having an end por- 50 tion projecting beyondsaid base, a metallic rotor rotatively locked to said shaft at theprojecting' portion, said rotor consisting of a rigid elongated memberhaving at least one downturned end with the corners rounded, and aplurality of stau shaped contacting portion on the inner end of saidbody portion, said contacting portion having its free end substantiallyflat with side ears bent away from said rotor and adapted to makecontact between said flat portion and said bent end of the rotor.

2. The switch of claim 1 wherein said rotor has a slot between therounded corners of the bent ends, said .slot being somewhat wider thanthe flat portion of the stationary contact whereby an indexing action isobtained.

3. The structure of claim 1 wherein said bushing projects beyond saidbase toward the rotoi side of said base, a metal washer disposed arouncsaid bushing and abutting said base, said waahel being provided with afinger extending towarr said rotor, a washer rotatively locked to askshaft disposed between said rotor and first washer, said second washerhaving a slot into whlcl the finger of said first washer projects andbeim large enough so that a predetermined anguia1 rotation of the rotoris permitted.

HENRY M. DRESSEL. KENNETH C. ALLISON. EDWARD J. MASTNEY.

